/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.bitactor.framework.core.net.api.suport;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 连接的ip计数器
 *
 * @author WXH
 */
public class ConnectIPCounter {
    /**
     * IP统计计数
     */
    private static final Map<String, Integer> COUNTS = new ConcurrentHashMap<>();

    /**
     * 添加指定ip连接+1
     *
     * @param ip
     * @return
     */
    public static int add(String ip) {
        return COUNTS.merge(ip, 1, Integer::sum);
    }

    /**
     * 指定ip连接-1
     *
     * @param ip
     */
    public static void sub(String ip) {
        COUNTS.computeIfPresent(ip, (k, v) -> v > 1 ? v - 1 : null);
    }
}
